# Heidelberg 2015 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 1: Quantum Optics I

### Q 1.1: Vortrag

### Montag, 23. März 2015, 11:30–11:45, C/HSO

**Time multiplexed photonic quantum walks** — •Thomas Nitsche^{1}, Fabian Elster^{1}, Sonja Barkhofen^{1}, Aurél Gábris^{2}, Jaroslav Novotny^{2}, Igor Jex^{2}, and Christine Silberhorn^{1} — ^{1}Applied Physics, University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany — ^{2}Department of Physics, Faculty of NuclearSciences and Physical Engineering, Czech Technical Universityin Prague, Brehová 7, 115 19 Praha, Czech Republic

Photonic quantum walk systems can be considered as a standard model to describe the dynamics of quantum particles in a discretized environment and serve as a simulator for complex quantum systems, which are not as readily accessible. However their experimental realization requires setups with increasing complexity in terms of number of modes and control of the system parameters. A key element for a versatile simulator is the ability to control the quantum-coin, which is the main entity responsible for the evolution of the quantum walk. Breaking links in the underlying graph structures leads to the concept of percolation, addressed in recent theoretical studies. In a generalization the graph topology can even change in time, modelling a randomly evolving, fluctuating medium. Yet, the implementation of dynamically changing graphs poses severe challenges. Here, we present an experiment with precise dynamical control of the underlying graph structure, facilitating the blending of percolation with a genuine quantum process while exploiting the high intrinsic coherence and versatility of a time-multiplexed quantum walk architecture.